One of the more interesting aspects of Twitter (in my opinion) is how it can be used as a business tool. More specifically, lately I've come to notice that Twitter is a not only a powerful networking tool, but also a hidden repository for job alerts, those for Ruby and Ruby on Rails developers included. Of course, you may already follow the list of "Twittering Rubyists" put together by Satish Talim last year, but there are some other Twitter IDs to add to follow if you're looking for a job.
A quick Twitter search this morning revealed a number of job postings for Ruby developers, posted by such users as @OnlineRubyJobs, @jobsrubynow and @rorjobs. And those were just the Ruby specific posters--many IT job recruiters had alerts as well. The point? If you're looking for a job in Ruby, don't overlook the possibilities of Twitter and its search capacities.
About.com Guide to Job Searching, Alison Doyle, offers job hunters a number of tips for using Twitter in the job hunt.